John eldee



1. ELDER, lr. Automatic Valves for Steam-Radiators ratem'eddmu;1875,

steam radiator or coil.

NrrED STATES PAT Joan ELDER, JR, or NEW YORK, N. Y.

Specification forming part of Letters Patent No. 158,692, dated January12, 1875; application filed May 5, 1874.

provide an air-valve,'through which the air escapes, and said valve isclosed by expansion I due to change of temperaturewhen the steamreachesthe valve.

A spring mounted in a movable bar within the tube, and contiguous to theair-valve, has been used to act upon the valve, but the bar obstructsthe, free passage of a r or steam to, the valve, and, being exposed tothe same temperature, the spring will only be changed in form, inconsequence of theditterence in expansion due to the difference ofmeta-ls, the spring usually being of brass and the bar of iron.

My improvement is made with reference to simplifying the constructionand dispensing with the-said bar. I make use of a tube with a shoulderupon thcinteri'or, against which one end of the spring rests, and at theother end the spring is supported by a block and movable cap at the endof the tube. Thereby the spring is held in position without any bar, andthe surrounding tube will not heat up and expand as rapidly as the sprinThe air-valve screws into the spring, and, as ithas to be adjusted fromtime to time, it is liable to be disconnected and lost. I apply a guardaround the valve-stem, with an opening for such stein' that is smaller.than the valve, so that said valve cannot be accidentally withdrawn toofar or lost.

In the drawing, Figure 1 is a vertical section ot' the improvementcomplete, and Fig. 2 isa sectional plan at the line a .r.

v The tube a is made with a shoulder, b, preferably contiguous to thescrew-thread by which the tube a is connected to the tube 0 of the Thetube a is open at the upper end and receives a block, 0, within arecess, and a on p, f, is screwed upon the end and eoiiiines the parts frmly. The spring h, of brass similar material, is introduced within thetube a betin'e the-block cis inserted, and said block ccniincs the endof the spring firmly, and retains the spring to its place between theshoulder Z1 and the block 0. The air-vahc l is made with a screw-stem,o, passing through said spring h, and a seat, 4,

is provided for such valve, and the valve-stem is adjusted so that thevalve will remain open except when the spring is expanded and itscurvature increased.

The valve-head t may be milled, so that the valve can be easilyadjusted, and this head is smaller than thevalve, so that the guard ucan be introduced around the valve 1, between that and the head, theopening in such guard being smaller than the valve, so thatsaid valvecannot be entirely removed, except after removing this guard.

The guard may be made of sheet metal in the form of .a bridge, securedby the screws33, shown in Fig. 1, or, as a thim ble screwed upon theprojection forming the valve-seat, as shown in Fig. 2.

I am aware that a spring has been sustained at its ends within a tube,and that the center portion of such spring has actedas a valve against atubular seat, as in the Patent of W. W. Bartol, No. 65,0417. In thiscase, the adjustment can only be efi'ected by revolving the spring-andtube or the tubular seat, and as the air-valves of radiatorstrequentlyrequire adjnstmeut,.as well as cleaning, this device isinconvenient. lv my construct on the valve is easily adjusted orcleaned, because the screw-spindle passes through the spring, and theparts receiving and sustaining the ends of the spring secure that springfirmly and reliably in its relation to the valveseat.

1 claim. as my invention- 1. The tube a, made with the inward shoulder1), near one end, and the block 6, having a recess at one side andsecured by the cap f, in combination with the springh, supported by suchshoulder b and recess, and the airvalve having a screw-stem that isintroduced from outside the tube to, and passes through the spring, asand for the purposes set forth.

2. The guard a, surrounding the stem of the valve, and made with anopening of less diameter than the valve, in combination with the tube(1., adjustable air-valve I, and spring I, as and for the purposes-setfort-h.

Signed by me this 1st day of May, A. D. 1874.

JOHN ELDER, JR.

"Witn csses:

DOUGLAS A. Lnvnzn, Jr., GEO. T. PINcnnsY.

